Sakuranbo (J-POP) (Popularized by Otsuka Ai)
Kibun Joujou (J-POP) (Popularized by mihimaru GT)
Natsu Matsuri (J-POP) (Popularized by whiteberry)
Ketsu no Asa ni (Movie "Brave Story" Theme Song) (popularized by Aqua Timez)
WON'T BE LONG (J-POP) (Popularized by EXILE x Koda Kumi)
Mataaimashou (J-POP) (Popularized by SEAMO)
DANCE2 feat. Soysauce (Glico "Pocky Chocolate" CM Song) (Popularized by ORANGE RANGE)
Anpanman no March ("Sore Ike! Anpanman")
Mei Tantei Conan Main Theme (Anime Movie "Mei Tantei Conan")
Doraemon no Uta (Opening / Doraemon)
Pretty Cure 5, Smile gogo! (Yes! Pretty Cure 5)
Juuken Sentai Gekiranger (Opening "Juuken Sentai Gekiranger")
Together ("Pocket Monsters Diamond Pearl" Opening Theme)
Touch (Anime)
Tarako Tarako Tarako (Kewpie Tarako Cod Roe Pasta Sauce CM Official Song) (Popularized by Kigurumi)
Mori no Kuma-san (Nursery Rhyme & Folk Song)
Classic Wedding Melody Hen (Classic)
Super Mario Brothers (Game Music)

Huge thanks to Unknown Gamer for all the help!

Link